Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3ad1ffa767fff0afaa6ea95a69eef2eda420e985a6330e09ba720afafe4998c' 
  AND token = 'k/UOLGJd8ZzNK0EnY563MNB4BcKKIDFwOQn6A1ZaRss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}